Sewing-machine pulley



c. w. HDOUBLER. SEWING MACHINE PULLEY.

APPLICATION FltED MAR. 26, I920- Patented June 7, 1921.

slidably but armature CHARLES W. HDOUIBLER, 0F RACINE, WISCONSIN.

SEWING-MACHINE PULLEY.

To all'whomz't may concern: 7

Be it known that I, CHARLns W. HDoU- BLER, a citizen of the United States, and resident of Racine, in the county of Racine and State of Wisconsin, have invented new and useful Improvements in Sewing-Machine Pulleys, of which thefollowing is a description, reference :beinghadto the accompanying drawings, whichare a part of this specification. 1

The present 1nvent1on relates to certainnew and useful improvements in electrically driven :sewing machines, and refers more particularlylto the friction pulley employed to. drivingly connect the motor armature shaft'with the sewing machinedrive or hand wheel.

One object of this invention is to provide an electrically driven sewing machine in which the armature shaft of the motor has a pulley mounted "on one end thereof and infrictionalengagement with the hand or drive wheel of the machine, the pulley being non-rotatably mounted on the shaft ,whereby the same will readily compensate for any irregularities -in the machine hand or drive wheel.

A further object of this invention is to provide a friction pulley of'the class described including two spaced apart disks and-adjustable with respect to each other, whereby the same may be adjusted to corn pensate-forwear and to alsouada pt the same to drive wheels of various diameters.

A still further object of the invention is to provide a friction pulley for an electrically driven sewing machine :which is of simple construction, is strong and durable and is well adapted for the purpose ,der scribed, 7

-Withthe above and other objects 1n VleW which will appear as the descriptionproceeds my invention residesiin the novel construction, combination .of parts substantially as hereinafter described and more par- ,ticularly' defined by the appended claims, it

being understood thatsuch changes in the precise embodiment of the herein disclosed inventionmay' be made as come within the scope- 0f the claims, 7 7

In the accompanying drawing have illustrated fftwo completeexamples of the @physical embodiment structedaccording to the best modesl have Specification of Letters Patent.

of my invention con- 7 Patented June '7, 1921.

'Applicatim, fild March :26, 1920. Serial No: 368,970.

porting standard'of a sewing machine, 6 a

longitudinally extending drive shaft journaled inthe overarm (not shown) of the machine, and 7 a drive or hand wheel fixed to the portion of=the shaft 6 projected outwardly of the standard 5. As is usual in sew- .ing machine constructions, the shaft 6*is connectedwith the usual ,mechanism'of the machine .for driving the same upon rotatlon, and the shaft 6, in the present instance 1s rotated by means of an electrical motor 8 having its armature shaft :9 connected with thehand wheelloy-means of'an improved form of friction-pulley now about to be-described. v a i My improved form of friction-pulley includes a sleeve 10 formed at its inner end with a flange 11 and having its outer end exteriorly threaded, asat 12, to receive an adjusting securing nut 18; Mounted-upon the sleeve 10 are two complementary disks 14 and 15 having their peripheries oppositely curved,-as at 16, to provide an an- 'nular groove in which the periphery of the wheel? runs. The disk 14: is tightly pres'sed onthe sleeve 10' and is engaged against the flange 11, and the disk 15 is slidably mounted upon the sleeve, but held from rotation with "respect thereto (by means now to be described. 7

A flange; plate 17 is sli'dably mounted upon the sleeve 10 and issecured to the outer face of the disk 15 by means of screw members 18, which screw members have their inner ends reduced and plain toform guide pins 19 which are slidable within apertures20 .formedin the disk 14 and flange ll. wFrom this construction, it will be readily seen that the disk 15 maybe readily moved toward and away from the disk 14 but is held from rotation with respect thereto by means. of 1 the guide pins 19 formed integral with the screws 18. The disks 14 and 15 are retained in spaced relation by means of an extensile spring 21 coiled about the sleeve 10 between the disks, and the action of said springis restrained by means of a stronger extensile spring 22 coiled about the sleeve 10 intermediate the nut 13 and flange plate 17.

With this construction the peripheries 16 of the disks 14 and 15' are at all times held in frictional engagement with the periphery of' the machine drive wheel 7 and when the peripheries of the disk become worn, such wear is compensated by tightening the nut 13. The nut 13 is preferably knurled for convenience in adjusting the same without the use of tools of any kind.

As the drive wheels of sewing machines in general use do not run perfectly true, the sleeve 10 is slidably but non-rotatably mounted upon the armature shaft so that the same will readily give and follow any irregularity in the run of the fly wheel 7.

In the present instance 1 have illustrated the sleeve 10 as being slidably splined to the shaft 9 by a key member 23, but it will be readily understoodthat any other means disk engaged may be employed.

In Fig. 3 I have illustrated a slightly modified form of my invention in which the disks Hand 15 are held in spaced relation by means of a yieldable or resilient member 24 which takes the place of the spring 21, and the disk 15 being retained from rotation with respect to the sleeve firmly clamping the disks 14 and 15 and the spacer 2 1 between the flange 11 and flange plate 17. In this form of my inven tion the spring22 is eliminated and the nut 13 abuts directly against the plate 17. As the disk members 14; and 15 wear, the wear is compensated for by tightening the nut 13 which compresses the spacer 24 and forces it partly into the annular groove formed by the curved surfaces 16 as will be readily apparent.

What I claim as my invention is:

' 1. A device of the class described, comprising a pair of opposed disks, yieldable means disposed between the disks to normally tend to urge the same apart, and means yieldably resisting the movement apart of the disks under the action of said first mentioned means.

2. A device of the class described, comprising a sleeve, a pair of disks on said sleeve and having their peripheries oppositely curved to form an annular groove, one of said disks being rigidly fixed to said sleeve, a flange plate mounted on said sleeve and engaging the other of said disks, and means for retaining said flange plate'and thereby in the proper position relative to the other disk.

3. A device of the class described, comprising a sleeve having an annular flange on one end thereof, a pair of disks on said sleeve and having their peripheries oppositely curved to form an annular groove, one of said disks being fixed to said flange, a flange plate mounted on said sleeve and having the other of said disks secured there to, and means for retaining said flange plate and disk carried thereby inthe proper position with respect to the other disk.

4. A device of the class described comprising a sleeve havingan annular flange on one end thereof, a pair of disks on said sleeve, one of said disks being fixed with respect to said flange, a flange plate slidably but non-rotatably mounted on the sleeve and having the other disk fixed with respect thereto, yieldable means retaining said disk in spaced relation, and means for retaining said flangeplate upon the sleeve. 7

5. A device of the class described comprising a sleeve having an annular flange on one end thereof, a pair of disks on said sleeve, one of said disks being fixed with respect to said flange, a flange plate slidably but'nonrotatably mounted on the sleeve and having the other disk fixed with respect thereto, spring means normally urging the disks apart, and means engageable with said flange plate to resist the force of said spring means. a I

6. A device of the class described comprising a sleeve having an annular flange on one end thereof, a pairof'disks on said sleeve, one of said disks being fixed with respect to said flange, a flange plate slidably but non-rotatably mounted on the sleeve and having the other disk fixed with respect thereto, an extensile spring confined between the disks and urging the same 'to spaced relation, and a second spring engageable with said flange plate'to resist the first mentioned spring.

7. A device of the class described, comprising a sleeve having an annular flange on one end thereof, a pair of disks on said sleeve, one of said disks being fixed with respect to said flange, a flange plate slidably but nonrotatably mountedon the sleeve and having the other disk fixed with respect thereto, an

extensile spring confined between the disks and urglng the same apart, and a second respect to said flange, a flange plate slidably but non-rotatably mounted onthe sleeve and having the' other disk'fixed with respect thereto, an extensile spring'confined between the disks and urging the same apart, a second spring engaging said flange plate to restrain the action of the first mentioned spring, and means for adjusting the tension of said second spring.

9. A device of the class described, comprising a sleeve, a pair of disks on the sleeve, one of said disks being fixed with respect to the sleeve and the other being slidablethereon, a guide pin carried by one of said disks and engageable in an aperture in the 10 other disk, and means adjustably maintaining the disks in spaced relation.

In testimony whereof, I affix my signature.

CHARLES W. HDOUBLER. V 

